Incubator.



No. 782,114. PATENTBD FEB. 7, 1905. K. R. DUNTON.

{ IN GUB ATOR. urmoumn FILED r23. s. 1903.

Patented February '7, 190B.

NTTED STATES PATENT OFFICE.

KERVIN R. DUNTON, OF SOMERVILLE, MASSACHUSETTS,ASSIGNOR TO THE CORNELLINOUBATOR MFG. CO., OF ITHAOA, NEW YORK.

INCUBATOR,

SPECIFICATION forming part of Letters Patent No. 782,114, dated February7, 1905.

- Application filed February 5, 1903. Serial No. 141,984.

T of] lw/mm/ it 'mmy con/corn:

Be it known that I, KERVIN R. DUNTON, a citizen of the United States,residing at the city of Somerville, in the county of Middlesex and Stateof Massachusetts, have invented certain new and useful Improvements inIncubators, of which the following is a specification.

My invention relates particularly to improvements in incubators in whicha door through the side or other wall of the incubator is used foraccess to the egg-chamber.

The objects of my invention are, first, to provide a door with doublewalls and air-space between and which will be light and inexpensive andat the same time eflicient and durable; second, to provide a door whichwith suitable adjacent construction will have the same temperature ofair within it as between the walls of the incubator. by the constructionillustrated in the accompanying drawings, in which Figure 1 is aperspective of the front double walls of an incubator or refrigeratorand showing the door-opening and the air-space between the double walls.Fig. 2 is a similar perspective with door partly open. Fig. 3 is aperspective view of the door detached. Fig. 4. is a section through A Bof Fig. Fig. 5 is a detail view showing the construction of the door.

Similar figures refer to similar throughout the several views.

The double walls 1 2 of an incubator are shown in Figs. 1 and 2 withspace 3 between them, which in an incubator is usually left vacant forthe circulation of air, but which may also be left as an air-space. Inthe ordinary construction heretofore this space is walled off around thedoor-opening 4:, so that there is no communication with the dooropening.In my construction there is preferably communication with this air-spaceat and around the door-opening, as indicated at 5, the advantages ofwhich will be hereinafter stated.

The door 6 is built with double walls and an air-space 7 between withvarious openings 8 through the edge of the door, affording freecommunication with such air space. The

parts 1 attain these objects simplest construction is shown in Figs. 3and t, in which the two walls 9 10 are separated the requisite distanceto correspond in extreme thickness to the extreme thickness of the sidein which the door is used by the corner-blocks 11, which for theordinary size of an incubator-door are sutlicient. In larger doors otherblocks 12, intermediate the sides and ends, may be used. The walls ofthe door are made with a bevel or taper edge 13 1%, the inner wall beingthe smaller, so that the door will open more readily and shut tight.This particular feature is not new as applied to doors with solid orclosed edges. To make the door air-ti ht when closed, a strip of felt,rubber, or other suitable material 15 is countersunk in the edges ofeach wall of the door and projects beyond said edges.

\Vhen the door 6 is closed and is constructed as above described and thedoor-opening at around its margin is open to the space 3, it willreadily be seen that there is then continuous air-space andcommunication between the walls of the front of the incubator, includingthe door. In fact, such communication is practically as continuous anduninterrupted as it the walls of the door were intogral with the wallsof the rest of the incubator. This insures the same temperature of wallsaround all parts of the egg-chamber, which is an importantconsideration, especially if, as is done in some incubators, acirculation of air is maintained or provided for in such space betweenthe walls of the incubator.

1 am aware that doors with air spaces, chambers, or pockets therein, butnot communicating exteriorly, have been heretofore used in safes,refrigerators, and the like, but that is. not my construction and I donot claim it.

\Vhat I do claim, however, and desire to secure by Letters Patent, is

1. In combination with the walls of an incubator, of a door therefor,comprising a plurality of walls, each wall comprising a frame having acentral openin transparent means secured to said frame and closing saidopening, said frame provided with beveled edges,

countersunk in and extending the entire 5 length of said edges andprojecting beyond the same, and an approximately rectangularspacing-block of rigid materialsecured near each corner of andinterposed between said Walls for retaining the same in an assembled 2stationary position.

In testimony whereof I affix my signature in presence of two Witnesses.

KERVIN R. DUNTON.

Witnesses:

S. E. BEAN, HERBERT WV. DoToN.

